| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 19084 |
94.2%
|
| 2 | Yes-some difficulty | 763 |
3.8%
|
| 3 | Yes- a lot of difficulty | 373 |
1.8%
|
| 4 | can not do at all | 36 |
0.2%
|
| Sysmiss | 56414 |